Source: Medieval castles (2005), Ch. 1 : The Great Tower : Norman and Early Plantagenet Castles
“Chateau Gaillard had utilized the last of the newly built, huge great towers, and Rochester had depended on its early twelfth-century tower. During the course of the thirteenth century defense shifted to a towered wall, the enceinte or enclosure castle. Two plans emerged: the castle could rely on a series of courtyards, which had to be taken one after another, or on a concentric defense in which a second wall entirely surrounded the inner wall.”
Source: Medieval castles (2005), Ch. 2 : The Castle as Fortress : The Castle and Siege Warfare
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Marilyn Stokstad 27
art historian 1929–2016Related quotes

Krzyżtopór - lordly fortress belonging to the Ossoliński family at Ujazd, "Aura" 7, 1989-07, p. 20-22. http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.agro-10431a86-d55f-41c2-a32b-a56f6d26570e?q=fb98c219-0d8f-4b9e-88ea-9c0f94821cd5$5&qt=IN_PAGE
Source: Medieval castles (2005), Ch. 1 : The Great Tower : Norman and Early Plantagenet Castles
Source: Medieval castles (2005), Ch. 2 : The Castle as Fortress : The Castle and Siege Warfare
Source: Medieval castles (2005), Ch. 1 : The Great Tower : Norman and Early Plantagenet Castles
Source: Medieval castles (2005), Ch. 4 : The Castle as Symbol and Palace
Source: Medieval castles (2005), Ch. 1 : The Great Tower : Norman and Early Plantagenet Castles
Source: Medieval castles (2005), Ch. 2 : The Castle as Fortress : The Castle and Siege Warfare
Source: Medieval castles (2005), Ch. 5 : Impact and Consequences : The Afterlife of the Castle

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter V, Sec. 5